高等学校化学学报Issue(2)：342-348,7.DOI:10.7503/cjcu20150527
SAPO-18/SAPO-34共晶分子筛的合成及表征
Synthesis and Characterization of Intergrowth Structured SAPO-18/SAPO-34†
摘要
Abstract
SAPO-18(AEI structure) and SAPO-34(CHA structure) intergrowth structured silicoaluminophos-phate molecular sieves were synthesized hydrothermally with trimethylamine(TEA) and N,N-diisopropylethyl-amine(DIEA) as double templates. Influencing factors, such as DIEA content, SiO2 / Al2 O3 molar ratio and crystallization time were investigated in detail. The crystalline phase, morphology and acidic property of the products were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM) and tempera-ture-programmed desorption of ammonia(NH3-TPD), respectively. The results showed that well crystallized, morphology uniformed AEI/ CHA intergrowth structured silicoaluminophosphate molecular sieves with AEI/CHA= 74 / 26 could be synthesized under the following synthesis conditions: n ( DIEA) / n ( AEI) = 0. 2, n(SiO2 ) / n(Al2 O3 )= 0. 6 and the crystallization time 96 h. The extending of crystallization time resulted in the disappearance of SAPO-5 and the gradual increase of AEI/ CHA proportion. It is therefore concluded that the thermodynamic stability of SAPO-5, SAPO-34, SAPO-18 increased in this order. Dimethylether-to-olefins (DTO) reaction was chosen to test the catalytic performance of the prepared catalysts. The prepared catalyst using TEA-DIEA as double templates exhibited excellent catalytic performance in DTO ( dimethyl ether to olefins) process. The conversion of dimethylether and selectivity of ethylene and propylene are up to 100%and 84. 29% , respectively.关键词
AEI/CHA共生相/三乙胺/N,N-二异丙基乙胺/双模板剂Key words
Intergrowth structured AEI/ CHA/Triethylamine/N,N-diisopropylethylamine/Double templates分类
化学化工引用本文复制引用
赵东璞,赵全升,张妍,石拓,姚横国,于建强..SAPO-18/SAPO-34共晶分子筛的合成及表征[J].高等学校化学学报,2016,(2):342-348,7.基金项目
国家自然科学基金(批准号:41206067)资助.? Supported by the National Natural Science Fundation of China(No.41206067) （批准号:41206067）
